1 package org.codehaus.plexus.interpolation;
2
3 /*
4 * Copyright 2007 The Codehaus Foundation.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 import java.util.Map;
20
21 /**
22 * Wraps a Map, and looks up the whole expression as a single key, returning the
23 * value mapped to it.
24 */
25 public class MapBasedValueSource extends AbstractValueSource {
26
27 private final Map values;
28
29 /**
30 * Construct a new value source to wrap the supplied map.
31 * @param values key,value of mapping.
32 */
33 public MapBasedValueSource(Map values) {
34 super(false);
35 this.values = values;
36 }
37
38 /**
39 * Lookup the supplied expression as a key in the wrapped Map, and return
40 * its value.
41 */
42 public Object getValue(String expression) {
43 return values == null ? null : values.get(expression);
44 }
45 }